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She didn’t seem to notice the dog taking a dump on the floor because she was busy Facetiming someone on her cell phone, he wrote in a Facebook post that has gone viral with more than 6,000 likes.

Another man tried to get the woman’s attention to tell her about her doggie’s disgusting deposit.

According to Hofstetter the woman bellowed, with no hint of irony, to her Facetime companion: “Some people are just so damned rude.”

Another person asked if she was just going to leave the mess on the floor and she replied, “They have people for that.”

Hofstetter waited for maintenance workers to clean up the poo, he wrote, then went to the gate for his flight to Tokyo.

Dog poo lady was there.

“Great – we were both going to Tokyo,” he wrote. “When I travel abroad, I get embarrassed by other Americans doing things one hundred times less embarrassing than leaving animal feces on the floor of an airport. To make it worse, her dog was now barking at everyone who walked by.”

Meanwhile, the woman was now listening to music — without headphones.

Hofstetter sat down next to her and found out she was heading to Tokyo, too.

“Then you better hurry,” he told her. “That flight got moved to gate 53C. This is the flight to London.”

He only meant to cause her a momentary flash of panic as payback for “how terribly she was treating everyone,” so what happened next caught him off guard, he wrote.

“She grabbed her bags and her dog in a huff, and stormed out of the gate without even checking,” he wrote. “She was so self-involved, she didn’t notice that the monitor at our gate still said Tokyo and almost everyone at the gate was Japanese.”

Guilt. He felt guilt.

He never saw her board the Tokyo-bound plane. Never saw the dog again, either.

“Her missing her flight was not my original intention, but it would be a fine punishment for her being so rude to everyone and making a low-paid stranger clean feces off the floor,” he wrote. “What makes me wonder if I went too far is the knowledge that Delta only has one flight to Tokyo each day. Whoops.”

Hofstetter’s story has incited debate on his Facebook page, where some people think he did, in fact, go too far and others think the woman deserved worse.

In one typical back-and-forth, one woman wrote that “it is completely wrong to go and take revenge on others that way. Okay, it was wrong for the woman not to clean up after the dog, but it’s not okay for you to play police here, you had to complain to the staff, who had to take action. Take care if Karma hits you now because of this.”

But another man argued that “the only thing worse than people who are rude, obnoxious, and self-absorbed are the people like you that sit back and say ‘it’s not my circus’ and continue letting people take advantage of or inconvenience others. Or wag their fingers in self-righteousness at others about how wrong it is to teach a (poopy) person a lesson.

“People never learn unless there are consequences. The fact that the guy felt a little guilty for doing that means that he is a good person, even if he took revenge on a (poopy) one.”